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Demonstration of an Effective Ultrastrong Coupling between Two Oscillators
- Source :
- Physical Review Letters, Physical Review Letters, American Physical Society, 2018, 121 (4), ⟨10.1103/physrevlett.121.040505⟩, Physical Review Letters, 2018, 121 (4), ⟨10.1103/physrevlett.121.040505⟩
- Publication Year :
- 2018
- Publisher :
- HAL CCSD, 2018.
-
Abstract
- International audience; When the coupling rate between two quantum systems becomes as large as their characteristic frequencies, it induces dramatic effects on their dynamics and even on the nature of their ground state. The case of a qubit coupled to a harmonic oscillator in this ultrastrong coupling regime has been investigated theoretically and experimentally. Here, we explore the case of two harmonic oscillators in the ultrastrong coupling regime. Probing the properties of their ground state remains out of reach in natural implementations. Therefore, we have realized an analog quantum simulation of this coupled system by dual frequency pumping a nonlinear superconducting circuit. The pump amplitudes directly tune the effective coupling rate. We observe spectroscopic signature of a mode hybridization that is characteristic of the ultrastrong coupling. We experimentally demonstrate a key property of the ground state of this simulated ultrastrong coupling between modes by observing simultaneous single- and two-mode squeezing of the radiated field below vacuum fluctuations.
- Subjects :
- Physics
Quantum Physics
Condensed Matter - Mesoscale and Nanoscale Physics
FOS: Physical sciences
General Physics and Astronomy
Quantum simulator
01 natural sciences
010305 fluids & plasmas
[SPI.AUTO]Engineering Sciences [physics]/Automatic
Nonlinear system
Coupling (physics)
[PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]
Qubit
Quantum electrodynamics
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
Quantum Physics (quant-ph)
010306 general physics
Ground state
Quantum
Quantum fluctuation
Harmonic oscillator
Subjects
Details
- Language :
- English
- ISSN :
- 00319007 and 10797114
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters, Physical Review Letters, American Physical Society, 2018, 121 (4), ⟨10.1103/physrevlett.121.040505⟩, Physical Review Letters, 2018, 121 (4), ⟨10.1103/physrevlett.121.040505⟩
- Accession number :
- edsair.doi.dedup.....b229250e3d38a487db949ad00718ab13